To improve the safety performance of Li-ion batteries using cathodes without sacrificing battery capacity, a new electrode concept using a multilayered cathode as an alternative to a mixture of different kinds of powder is introduced. Results from a double-layered cathode consisting of a main layer with a sublayer on top of an aluminum current collector are presented. The mechanism of how the layer improves the tolerance of the batteries against overcharging is discussed.
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Imachi et al. (2007) studied this question.
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